body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
  padding: 20px;
  max-width: 600px;
  margin: auto;
}

h1 {
  background-color: #007FFF; /* xanh nước biển nhạt */
  color: white;
  padding: 10px;
  border-radius: 10px;
  text-align: center;
}

h2 {
  text-align: center;
}

form {
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  box-sizing: border-box;
}

label {
  display: block;
  margin: 10px 0 5px;
}

input, select, button {
  width: calc(100% - 20px);
  padding: 10px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 5px;
  box-sizing: border-box;
  margin-left: auto;
  margin-right: auto;
  display: block;
}

button[type="submit"] {
  background-color: #003366; /* xanh thẫm */
  color: #FFD700; /* vàng */
  border: none;
  cursor: pointer;
  font-weight: bold;
  font-size: 20px; /* chữ to hơn */
  padding: 15px;    /* nút lớn hơn */
  margin-top: 20px; /* thêm khoảng cách phía trên */
}

button[type="submit"]:hover {
  background-color: #002244;
}

#time-slots {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.slot {
  flex: 1 1 45%;
  background-color: #e7f3ff;
  text-align: center;
  padding: 10px;
  border-radius: 5px;
  cursor: pointer;
}
.slot.selected {
  background-color: #007bff;
  color: white;
}
iframe {
  width: 100%;
  height: 300px;
  border: none;
}

.logo {
  display: block;
  margin: 0 auto;
  max-width: 30%;
  height: auto;
  aspect-ratio: attr(width) / attr(height); /* sẽ bị bỏ qua, nhưng giữ ở đây cho logic */
  object-fit: contain; /* đảm bảo giữ tỷ lệ */
}

.map-box {
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  margin-top: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  box-sizing: border-box;
}

.map-box iframe {
  width: 100%;
  height: 300px;
  border: none;
  border-radius: 10px;
}

#time-slots .het-cho {
  flex-basis: 100%;
  color: red;
  font-weight: bold;
  text-align: center;
}